//! This module contains various utility/helper functions that do not fit into any other module

use serde::{Deserialize, Serialize};

use crate::constants::{APP_USER_AGENT, MASTER_SERVER_URL, SERVER_BROWSER_ENDPOINT};

#[derive(Serialize, Deserialize, Debug, Clone)]
pub struct NorthstarServer {
    #[serde(rename = "playerCount")]
    pub player_count: i32,
}

/// This function's only use is to force a `panic!()`
// This must NOT be async to ensure crashing whole application.
#[tauri::command]
pub fn force_panic() {
    panic!("Force panicked!");
}

/// Returns true if built in debug mode
#[tauri::command]
pub async fn is_debug_mode() -> bool {
    cfg!(debug_assertions)
}

/// Fetches `/client/servers` endpoint from master server
async fn fetch_server_list() -> Result<String, anyhow::Error> {
    let url = format!("{MASTER_SERVER_URL}{SERVER_BROWSER_ENDPOINT}");
    let client = reqwest::Client::new();
    let res = client
        .get(url)
        .header(reqwest::header::USER_AGENT, APP_USER_AGENT)
        .send()
        .await?
        .text()
        .await?;

    Ok(res)
}

/// Gets server and playercount from master server API
#[tauri::command]
pub async fn get_server_player_count() -> Result<(i32, usize), String> {
    let res = match fetch_server_list().await {
        Ok(res) => res,
        Err(err) => return Err(err.to_string()),
    };

    let ns_servers: Vec<NorthstarServer> =
        serde_json::from_str(&res).expect("JSON was not well-formatted");

    // Get server count
    let server_count = ns_servers.len();

    // Sum up player count
    let total_player_count: i32 = ns_servers.iter().map(|server| server.player_count).sum();

    log::info!("total_player_count: {}", total_player_count);
    log::info!("server_count:       {}", server_count);

    Ok((total_player_count, server_count))
}